问题描述
有一个大量的阅读自我参照的问题，但我似乎无法找到一个回答我的问题。
There's a lot of reading on self referencing problems, but I can't seem to find an answer to my question.
说我有一个人（A），和我想有一个合作伙伴，另一个人（B）。当然，这意味着B有人类A.你将如何解决这个问题的合作伙伴？理想情况下，我应该只需要做的：
Say I have a Human(A), and I want A to have a partner, another Human(B). Naturally, it means that B has a partner in human A. How would you solve this? Ideally, I should only have to do:
humanA.Partner = humanB;
和humanB将自动获得Humana公司作为合作伙伴。
and humanB would automatically get humanA as a partner.
我本来以为我可以创造一个人类enity，并添加一个协会，是这样的：
I would have thought I could create a Human enity, and add an Association, something like:
END1 实体：人的，多重性： 0..1 的，导航属性：合作伙伴的
END2 实体：人的，多重性： 0..1 的
End2 Entity:Human, Multiplicity:0..1
所以，每个人都有零个或一个合作伙伴是一个人。
So, each human has zero or one Partner which is a human.
感谢您的时间。
推荐答案
1：0..1映射只有在使用的。这意味着，当有关的实体FK也是它的PK。因此，自参考1：0..1不可能存在。我想，你甚至无法在数据库中直接映射。
1:0..1 mapping is possible only when entities "share" primary key. It means when the related's entity FK is also its PK. So self referencing 1:0..1 cannot exist. I think you can't even map it in database directly.
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